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I have just completed the same exhaust set up as in your pic...
Cat By-Pass
Cup Pipe
OEM secondary muffler
K&N with open air box
A couple of questions (since my RSA is still on jack stands)...
Did you notice any performance improvement, Fabspeed claims about 15hp?
Satisfied with sound?
Any heat issues adjacent to the Cat By-Pass?
Any other comments?
Thanks. The sound is great. I am not sure about HP gains, but throttle seems alot more responsive now. I removed the airbox and have a K&N cone filter. Intake suction noise sounds very nice.